Antonio "Nino" Castellini (14 April 1951 – 26 August 1976) was an Italian boxer who won a bronze medal at the 1971 Mediterranean Games in the light-middleweight category.
Next year he competed at the Munich Olympics, but was eliminated in the first round by the eventual silver medalist Wieslaw Rudkowski.
After the Olympics he turned professional, and won a national super welterweight title in 1974–1976.